Lambert salvi



Lx SALVI.

SOUND BOX FOR TALKING MACHINES.

APPLICATION FILED MAR. 25. I920.

Patentgd Dec. 7 1920.

LAMBERT SALV I, OF PITTSBURGH, PENN'SYLV.P1N'IA.

SOUND-BOX FOB, TALKING-MAUHINES.

Specification of Letters JPatent.

Patented Dec. '7, 192d Application filed March 535, 1920. Serial No. 368,850.

To all whom it may concern:

Be it known that I, LAMBERT SALVI, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Sound-Boxes for Talking-Machines, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to improvements in sound boxes for talking machines, and particularly of the type utilizing a horizontal disk record.

One object of my invention is to provide an improved pivotal support for the needlearm, whereby the pivots are adjusted to tight positions by a simple construction.

Another object 01 m invention is to provide the needle-arm wlth a pivotal support, comprising a plate having inturned pivotal ends adapted to engage notches in the outer sides of the vertical arms which form a part of the pivotal support, and to separate these arms by a tapered screw for causing a tight pivotal connection between the needlearm and its support.

A further object of my invention is to provide a simple constructlon of sound box for supporting the sound reproducing disk.

In the accompanying drawings- Figure l is a perspective view of a sound box embodying my improvements.

Fig. 2 is a central sectional view taken longitudinally the needle arm.

Fig. 8 is an edge view looking toward the needle-arm support.

Fig. 4 is an enlarged top plan view of the needlearm pivot and its support.

My improved sound-box comprises essentially two members, a main cup-shaped member 1, in which is placed the usual two elastic packing tubes 2, and between which the sound disk 3 is placed, and a second disk member 4 which overlaps the edge of the cup-shaped member and is held thereto by a suitable number of screws 5, which pass through the disk member and into the edge of the cup-shaped member 1. By this construction the sound-disk 8 is clamped between the tubular packings 2. This disk member 4 is provided with the usual collar 6 for attachment to the sound conveying arm 7, in a manner which is well understood by those skilled in the art and need not be further described.

My improved needle-arm pivot constructlon comprises a member or plate 8, which is connected to the outer end of the needle arm and has outwardly and inwardly turned p vot points 10. This plate 8 is intermecuately connected to the needie-arm, as clearly shown, and this connection is a rigid one.

i provide a pivot support consisting of a plate 11, which attached to the outer edge of the cup-shaped member 1 in any suitable manner, but here shown, preferably, by screws 12, which pass through the plate 11 and into the edge of the cup-shaped member 1. This plate 1.1 is provided with a vertical slot 13, thus biturcating the plate, and this slot is widened at its upper end forming two separated arms 14, between which the needlereceiving socket 15 passes, and this socket 115 is provided with the usual thumb screw 16, for clamping the needle point 16 therein, in the usual well-known manner. ihe outer sides of the arms 14 are provided with small recesses 17, into which the inturned pivotal points 10 extend. A tapered screw 18 enters the slot 13, just below the arms 14, and serves to separate the arms 14 and to force them outward and cause the pivotal points 10 to tightly engage the recesses 17.

By means of a needle pivotal construction, as here shown and described, with the screw 18 removed, the arms 14 may be pressed near enough together to permit the pivotal point 10 to enter the recess 17. By placing the tapered screw 18 in the slot 13, as shown, the arms 14 will be separated by the taper as the screw is forced inward, and this will cause the tight engagement of the pivotal point 10 with the recess 17 of the arms 14. By this construction, the pivotal connection of the needle arm is not subject to working loose and lost motion in the pivotal connection is absolutely prevented. lit insures an absolutely tight needle arm pivotal connection at all times, thus preventing any loss in the sound waves between the needle and the sound disk 3, by loosening or lost motion in the pivotal connection. Aside from this advantage and result, the arrangement affords a very simple construction as well as a very effective one.

While I have shown the pivotal point 10 formed by turning the ends of the plate 8 outward and inward, li desire it to be understood that this arrangement could be re versed without departing from my improve-g ment. That is to say, the plate 8 could be placed outside of the arms 14, and the pivotal point 10 extended inward instead of outward.

Generically speaking, the plate 8 may be aptly termed a plate having oppositely disposed piVotalhook-shaped ends and the supporting plate 11 a bifurcated plate.

It may further be stated that the plate 8 may be connected to the needle arm 9, and extend in a position at right angles to that shown, without departing from the scope of my invention. That is to say, the plate 8 may be placed over the extremities of the arms 14 and secured to the needle socket 15, in any desired manner. 7

I do not limit myself to the exact construction of parts-here shown, as they may be varied bythose skilled in the art without departing from the spirit and scope of my present improvement? Having thus described my invention, What I claim and desire to secure by Letters Patent is:

1. A needle support for sound boxes, comprising a sound disk carrying box, a disk supported thereby, a bifurcated pivotal support secured to the sound box,1a needle-arm, a pivot member carried by the needle arm and having oppositely disposed hook-shaped pivot points engaging the support, and means for expanding the bifurcated plate to engage the pivot points.

2. A nee'dle'support for sound boxes, comprising a sound disk supporting box, a

' needle support comprising a plate secured to the box and having separated arms, a pivot member carried by the needle arm and projecting to the outer side of the separated arms, the separated arms and pivot member having" respectively pivots and pivot recesses, and means for separating the arms to cause a tightly pivotal connection between the pivots and the recesses.-

3. A needle-arm pivotal support for sound boxes, comprising a sound box, a pivot support connected to the sound box and having projecting separated arms, a needle arm extending between the separated arms, a

pivotal plate carried by the needle arm and having lateral extensions projecting to the outer sides or" the separated arms, the separated arms and the pivotal plate having respectively pivots and pivot recesses, and means for separating the arms and causing an engagement of the recesses and pivots.

4. A needle-arm pivotal support, comprising a sound box, a pivot supporting plate having projecting separated arms, a needle arm extending between the separated arms, a pivot member having lateral extensions projecting to the outer sides of the separated arms, the separated arms and pivot plate having respectively pivots and pivot recesses, and means for adjustably separating the arms and causing an adjustable engagement of the pivots and recesses, for the purpose described.

5. A pivotal needle support, comprising a sound box, .a pivot supporting plate attached thereto and having projecting separated arms, a needle-arm extending between the separated arms, a pivot member connected to the needle arms and having lateral extensions projecting to the outer side of the separated arms, the pivot member and separated arms having respectively pivots and pivot recesses, the supporting plate having a slot opening into the space between the separated arms, and a tapered member forcibly entering the slot for extending the plate and separating the arms to cause the engagement oi the pivots and pivot recesses.

6. A needle arm pivotal support, comprising a sound box, a supporting plate attached to the sound box having separated arms, a

pivot member extending transverse the needle arm and connected therewith, the pivot member having oppositely disposed hook-shaped pivot ends, the outer sides of the separated arms having pivot recesses, and means for separating the separated arms to cause engagement of the hookshaped pivots and the recesses of the separated arms.

In testimony whereof I hereunto aflix my signature.

LAMBERT SALVI. 

